Synchronize users to the cloud and assign licenses
Before actually moving the user to Office 365, you must first confirm that they are synchronized to the cloud, and assign them a license. To do this, you use the Office 365 Admin Center.
To confirm that a user is synchronized with Office 365
Open the Office 365 Admin Center (https://portal.office.com).
On the left navigation pane, click Users and then Active Users.
Click Search for a User, and type the name of the user.
Confirm that you see the user, and that their status is Synched with Active Directory.
If the user is not yet synchronized, the next automatic synchronization should happen within three hours. Or you could force a synchronization sooner. For more information, see Force Directory Synchronization.
To assign the license
To assign the license in Office 365, see Assign or unassign a Cloud PBX license for a user.